Their songs include "If I Had a Hammer" (also called "The Hammer Song"), "Puff, the Magic Dragon", "Leavin' On a Jet Plane" written by John Denver, and "Blowin' in the Wind", written by Bob Dylan. They recorded other Dylan songs, helping his early career. They made records, toured to perform, and appeared on television shows, including The Smothers Brothers Comedy Hour.

Peter, Paul and Mary disbanded in 1970, but reunited later, made tours and recorded new music.